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Jets in polar coronal holes

Scullion, E., Popescu, M.D., Banerjee, D., Doyle, J.G. and Erdelyi, R. (2009) Jets in polar coronal holes. Astrophysical Journal, 704 (2). pp. 1385-1395. ISSN 1538-4357

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Abstract

Here, we explore the nature of small-scale jet-like structures and their possible relation to explosive events and other known transient features, like spicules and macrospicules, using high-resolution spectroscopy obtained with the Solar and Heliospheric Observatory/Solar Ultraviolet Measurements of Emitted Radiation instrument. We present a highly resolved spectroscopic analysis and line parameter study of time-series data for jets occurring on-disk and off-limb in both a northern and a southern coronal hole. The analysis reveals many small-scale transients which rapidly propagate between the mid-transition region (N IV 765 Å line formation: 140,000 K) and the lower corona (Ne VIII 770 Å line formation: 630,000 K). In one example, a strong jet-like event is associated with a cool feature not present in the Ne VIII 770 Å line radiance or Doppler velocity maps. Another similar event is observed, but with a hot component, which could be perceived as a blinker. Our data reveal fast, repetitive plasma outflows with blueshift velocities of 145 km s–1 in the lower solar atmosphere. The data suggest a strong role for smaller jets (spicules), as a precursor to macrospicule formation, which may have a common origin with explosive events.

Item Type: Article
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Mrs Megan Hobbs
Date Deposited: 17 Mar 2010 16:37
Last Modified: 07 Jun 2010 11:09
Published Version: http://dx.doi.org/10.1088/0004-637X/704/2/1385
Status: Published
Publisher: Institute of Physics Publishing
Identification Number: 10.1088/0004-637X/704/2/1385
URI: http://eprints.whiterose.ac.uk/id/eprint/10538

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